51646413 has 32 divisors (see below), whose sum is σ = 87060736. Its totient is φ = 26500608.

The previous prime is 51646409. The next prime is 51646421. The reversal of 51646413 is 31464615.

51646413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51646413 - 2² = 51646409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51646613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7545 + ... + 12657.

It is an arithmetic number, because the mean of its divisors is an integer number (2720648).

Almost surely, 2^51646413 is an apocalyptic number.

It is an amenable number.

51646413 is a deficient number, since it is larger than the sum of its proper divisors (35414323).

51646413 is a wasteful number, since it uses less digits than its factorization.

51646413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5173.

The product of its digits is 8640, while the sum is 30.

The square root of 51646413 is about 7186.5438842325. The cubic root of 51646413 is about 372.4031861067.

The spelling of 51646413 in words is "fifty-one million, six hundred forty-six thousand, four hundred thirteen".